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Preparation method of polyphosphate synergistic nitrophosphate fertilizer

A technology of polyphosphate and nitrophosphate fertilizers, applied in magnesium fertilizers, inorganic fertilizers, fertilization devices, etc., can solve the problems of explosive phosphorus utilization rate, easy troughing, etc., achieve high nutrient absorption and utilization rate, improve effectiveness, promote The effect of improving quality and increasing production

Pending Publication Date: 2021-06-11
SHENZHEN BATIAN ECOTYPIC ENG
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a preparation method of polyphosphate synergistic nitrophosphate fertilizer, which aims to solve the problems of high temperature in the polymerization section, easy to leak or even explode, and low phosphorus utilization rate in the prior art.

Method used

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  • Preparation method of polyphosphate synergistic nitrophosphate fertilizer
  • Preparation method of polyphosphate synergistic nitrophosphate fertilizer
  • Preparation method of polyphosphate synergistic nitrophosphate fertilizer

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preparation example Construction

[0016] The embodiment of the present invention provides a kind of preparation method of polyphosphate synergistic nitrophosphate fertilizer, and described method comprises the following steps:

[0017] The present invention provides one, and it is characterized in that, the method specifically comprises the following steps:

[0018] S01: preparing neutralizing solution;

[0019] S02: pump the neutralization solution into the concentration system at 135-175°C for preheating, evaporation, and gas-liquid separation to obtain concentrated slurry;

[0020] S03: Put the concentrated slurry into the 1# polymerization tank for pre-polymerization at 175-185°C to obtain grade I polymerization slurry;

[0021] S04: When the level of the first-grade polymerization slurry is full, overflow to the 2# polymerization tank, and add medium and trace elements to carry out re-polymerization under the condition of 180-185°C to obtain the second-grade polymerization slurry;

[0022] S05: Granulat...

Embodiment 1

[0046] The preparation method of polyphosphate synergistic nitrophosphate fertilizer specifically comprises the following steps:

[0047] 1) Preparation of neutralizing solution;

[0048] 2) Pump the neutralizing solution into the concentration system to perform preheating, evaporation, and gas-liquid separation at 175°C to obtain concentrated slurry with a mass concentration of 97.5%;

[0049] 3) Pre-polymerization: Put the concentrated slurry into the 1# polymerization tank, the feed rate is 25t / h, and heat the pre-polymerization under the condition of 180°C, the reaction time is 1.2h, and obtain the first-grade polymerization slurry with a mass concentration of 98.5 %;

[0050] 4) Re-polymerization: When the level of the first-stage polymerization slurry is full, overflow to 2# polymerization tank, add medium and trace elements, the mass fraction is 1.88% (magnesium oxide, zinc sulfate monohydrate, boric acid, the mass ratio of the three is 0.06:1.7 : 0.12), under the condi...

Embodiment 2

[0053] On the basis of Example 1, the temperature of step 2) evaporation and concentration was changed to 165° C. to prepare polyphosphate synergistic nitrophosphate fertilizer.

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Abstract

The invention is applicable to the field of nitrophosphate fertilizers, and provides a preparation method of a polyphosphate synergistic nitrophosphate fertilizer. The method comprises the following steps: preparing a neutralization solution; pumping the neutralized liquid into a concentration system, and carrying out preheating, evaporation and gas-liquid separation at 135-175 DEG C to obtain concentrated slurry; introducing the concentrated slurry into a 1 # polymerization tank, and carrying out prepolymerization at 175-185 DEG C to obtain I-grade polymerization slurry; when the liquid level of the I-grade polymerization slurry is full, overflowing the I-grade polymerization slurry into a 2 # polymerization tank, adding medium trace elements, and carrying out repolymerization at 180-185 DEG C to obtain II-grade polymerization slurry; and granulating, drying and screening the II-grade polymerized slurry to obtain the polyphosphate synergistic nitrophosphate fertilizer. According to the method, through two-stage polymerization reaction of prepolymerization and repolymerization, the technical problem that a polymerization section is easy to overflow and even explode at high temperature is solved, the effectiveness of phosphorus is improved, the nutrient absorption and utilization rate is high, the method has the characteristics of quick-acting and long-acting functions, and the quality improvement and yield increase of crops are promoted.

Description

technical field [0001] The invention belongs to the technical field of nitrophosphate fertilizer, and in particular relates to a preparation method of polyphosphate synergistic nitrophosphate fertilizer. Background technique [0002] Nitrophosphate fertilizer is a high-quality phosphorus compound fertilizer variety, with a reasonable nitrogen and phosphorus ratio structure, suitable for most crops to N and P 2 o 5 According to the survey and analysis of the Chinese Society of Plant Nutrition and Fertilizer, my country will have a capacity of 30 million tons of nitrophosphate fertilizer, which can replace 8 million tons of ammonium phosphate, reduce the emission of 20 million tons of phosphogypsum and reduce the production of 4 million tons of sulfur every year. consume. However, during the application of nitrophosphate fertilizers on the market, phosphate roots are easily fixed by metal ions such as iron and calcium in the soil, with weak migration ability, short fertilizer...

Claims

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Application Information

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IPC IPC(8): C05G3/40C05G3/90C05G5/12
CPCC05B11/06C05G3/40C05G3/90C05G5/12C05D5/00C05D9/00C05D9/02
Inventor 孟品品赵国军韩冬芳陈贵有王宗抗方进
Owner SHENZHEN BATIAN ECOTYPIC ENG
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